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SAGE Open Med Case Rep 2020 29;8:2050313X20933763. Epub 2020 Jun 29.

Christine M. Kleinert Institute for Hand and Microsurgery, Louisville, KY, USA.

The use of the medial femoral condyle free flap is a versatile option for the treatment of upper extremity non unions and reconstructive procedures associated with bone loss or osteonecrosis. The benefit of this type of flap is the viability of the bone which favors primary ossification and increases bone density. Vascularized free bone flaps are especially useful for the treatment of recalcitrant nonunions, or nonunions that have failed three or more treatments to obtain consolidation. Read More

Orthop Traumatol Surg Res 2020 Jul 3. Epub 2020 Jul 3.

SFHG, 52, rue Boissonade, 75014 Paris, France.

Introduction: Isolated lateral compartment osteoarthritis of the knee (LCOA) is 10 times less frequent than medial compartment involvement. Long-term assessments of unicompartmental knee arthroplasty (UKA) in this indication are rare, with small series.

Hypothesis: Survival and functional outcome of lateral UKA in a large series are quite acceptable; the strategy is suited for isolated LCOA. Read More

Knee Surg Sports Traumatol Arthrosc 2020 Jul 1. Epub 2020 Jul 1.

Orthopaedic Department, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland.

Purpose: The purpose of the present study was to compare total (TKA) and unicondylar (UKA) knee arthroplasty for spontaneous osteonecrosis of the knee (SONK), and to investigate potential correlations to radiographic parameters.

Methods: All consecutive patients with a magnetic resonance imaging (MRI) proven SONK treated with either TKA or UKA between 2002 and 2018 were analysed. The primary outcomes were postoperative complications and failure rates. Read More

J Arthroplasty 2020 Jun 4. Epub 2020 Jun 4.

Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.

Background: The direct relationship between clinical outcomes and femoral component positioning relative to a tibial insert remains unknown. We determined whether the femoral component position relative to the tibial insert could affect clinical outcomes after fixed-bearing unicompartmental knee arthroplasty (UKA).

Methods: The femoral component position relative to the tibial insert of 66 patients with anteromedial osteoarthritis and osteonecrosis of the knee who underwent fixed-bearing UKA was assessed at 2 weeks postoperatively. Read More

Diagn Interv Radiol 2020 Jul;26(4):355-362

Department of Radiology, University Hospital, Ludwig-Maximilians-University Munich, Munich, Germany.

Purpose: Diagnosis of bone marrow edema syndrome (BMES) can be challenging. There is sometimes uncertainty about the correct diagnosis of BMES on morphologic magnetic resonance imaging (MRI), since subchondral findings like lines and spots can be misinterpreted as "beginning" or "possible" avascular osteonecrosis (AVN). The aim of our study was to systematically assess the temporal course of BMES from first diagnosis on MRI until the end of clinical symptoms and the full disappearance of bone marrow edema (BME) to determine whether subchondral lines and spots detected in these patients can develop into osteonecrosis. Read More

Orthop J Sports Med 2020 Jun 8;8(6):2325967120922535. Epub 2020 Jun 8.

Sports Medicine and Arthroscopy Center, Yagi Orthopaedic Hospital, Sapporo, Hokkaido, Japan.

Background: Outcomes and complications at mid- or long-term follow-up after medial open-wedge high tibial osteotomy (MOWHTO) with the TomoFix locking plate have not been fully evaluated.

Purpose: To evaluate the complications and midterm clinical outcomes after MOWHTO using a TomoFix.

Study Design: Case series; Level of evidence, 4. Read More

Acta Orthop Traumatol Turc 2020 May;54(3):255-261

Department of Orthopedic Surgery, Fondazione Policlinico Universitario A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, Roma, Italy.

Objective: The aim of this study was to evaluate clinical and functional outcomes in diabetic patients undergoing tibiocalcaneal arthrodesis using a retrograde nail.

Methods: A total of 12 diabetic patients [8 men and 4 women; mean age at intervention: 56.8 years (range: 27-76 years)] who underwent tibiocalcaneal arthrodesis by a retrograde nail were enrolled in this study. Read More

J Arthroplasty 2020 May 19. Epub 2020 May 19.

Stanford University Medical Center Outpatient Center, Redwood City, CA.

Background: Early detection and intervention are critical to maintaining the native articular cartilage before collapse in secondary osteonecrosis of the knee (SOK). We conducted a retrospective study documenting the initial stage of presentation and the progression of SOK.

Methods: Our database was reviewed for patients younger than 65 years of age diagnosed with atraumatic SOK between 2002 and 2018. Read More

Pediatr Blood Cancer 2020 Aug 30;67(8):e28336. Epub 2020 May 30.

Department of Oncology, St Jude Children's Research Hospital, Memphis, Tennessee.

Background: Osteonecrosis is a debilitating complication in children and adolescents with acute lymphoblastic leukemia or acute lymphoblastic lymphoma (LLy). An objective screening test to identify patients at risk for symptomatic, extensive joint involvement will help manage osteonecrosis.

Methods: We performed a prospective, longitudinal pilot study with whole-joint magnetic resonance imaging (MRI) of shoulders, elbows, hips, knees, ankles, and hindfeet to evaluate the incidence and timing of osteonecrosis involving multiple joints in 15 patients with LLy aged 9-21 years at diagnosis. Read More

BMC Musculoskelet Disord 2020 May 23;21(1):323. Epub 2020 May 23.

Osteonecrosis and Joint Reconstruction Ward, Department of Joint Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, 710054, P.R. China.

Background: Consensus on tibial rotation in total knee arthroplasty (TKA) remains controversial. The present study aimed to investigate the closest anatomical reference to surgical epicondylar axis (SEA) among 10 tibial markers in Chinese adults.

Methods: This study included examination of 122 normal lower extremities. Read More

Medicine (Baltimore) 2020 May;99(20):e20259

First Ward of Orthopedis Department, First Affiliated Hospital of Jiamusi University.

Background: Femoral head avascular necrosis (FHAN) is a very common condition among elderly population. Previous studies have reported that total hip arthroplasty (THAP) can benefit patients with such condition. However, no study systematically addressed this topic. Read More

J Bone Joint Surg Am 2020 May;102(9):821-829

Department of Orthopedic Surgery and Sports Medicine, Mayo Clinic, Rochester, Minnesota.

Background: Spontaneous osteonecrosis of the knee has recently been termed subchondral insufficiency fracture of the knee (SIFK) to appropriately recognize the etiology of mechanical overloading of the subchondral bone. The purpose of this study was to assess clinical outcomes of SIFK based on progression to surgical treatment and arthroplasty, and to evaluate the risk factors that increase the progression to arthroplasty.

Methods: A retrospective review was performed on patients with a diagnosis of SIFK, as confirmed with use of magnetic resonance images (MRIs). Read More

Knee 2020 Jun 22;27(3):838-845. Epub 2020 Apr 22.

Department of Orthopedic Surgery, Akita University Graduate School of Medicine, Akita, Japan.

Background: Spontaneous osteonecrosis of the knee (SONK) is one of the acute knee pain disorders arising in elderly patients. The presence of knee varus alignment and the size of necrotic area have been reported as the negative prognostic factors in prior studies. However, no previous study has yet clarified the radiological analysis of the lower extremity in SONK compared with that in osteoarthritis. Read More

Clin Orthop Relat Res 2020 Jul;478(7):1636-1644

K. Ishibashi, E. Sasaki, Y. Yamamoto, Y. Ishibashi, Department of Orthopaedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan E. Sasaki, H. Otsuka, K. Kazushige, Department of Orthopaedic Surgery, Japan Community Health Care Organization Akita Hospital, Noshiro, Japan.

Background: Appropriate postoperative lower limb alignment is one important element of a successful unicompartmental knee arthroplasty (UKA). To predict postoperative alignment, it is important to investigate the association between preoperative imaging evaluations and lower limb alignment after medial UKA.

Questions/purposes: (1) Do preoperative valgus stress radiographic and MRI measurements (% mechanical axis, hip-knee-ankle angle, medial meniscal extrusion distance, and osteophyte area at the medial femur and tibia) correlate with postoperative lower limb alignment after UKA; and (2) Can useful cutoffs be calculated in advance of surgery for those findings that were associated with coronal-plane overcorrection?

Methods: We retrospectively analyzed 125 patients with medial knee pain who underwent UKA from January 2012 to October 2018. Read More

J Autoimmun 2020 Jun 16;110:102460. Epub 2020 Apr 16.

Division of Pediatric Immunology and Allergy, Joe DiMaggio Children's Hospital, Hollywood, FL, 33021, USA. Electronic address:

Corticosteroid associated osteonecrosis is bone death resulting from the use of chronic glucocorticoids and most commonly affects the femoral head, although the bones such as around knee joint, wrist joint and ankle joint can be affected. The pathogenesis is likely multifactorial, with genetic and environmental factors playing a role. Epigenetics may be the mechanism by which environment exerts it effects. Read More

Front Bioeng Biotechnol 2020 20;8:202. Epub 2020 Mar 20.

Canadian Centers for Regenerative Therapy, Toronto, ON, Canada.

An 18-year-old female patient with Systemic Lupus Erythematosus (SLE) and corticosteroid-associated extensive bilateral symptomatic knee Osteonecrosis (ON) (Ficat IV), treated with sequential intralesional injections of autologous bone marrow aspirate concentrate (BMAC) under ultrasound guidance. At 3 months, pain was almost absent (VAS) and KOOS/WOMAC showed significant improvement sustained up to 24 months. At 12 months MRI indicated bone maturation, significantly reduced BM edema and subchondral fluid volume, and no collapse/fragmentation signs. Read More

J Knee Surg 2020 Apr 7. Epub 2020 Apr 7.

Department of Orthopedic Surgery, Northwell Hospital Lenox Hill, New York, New York.

The number of total knee arthroplasties (TKAs) performed in the United States has increased considerably in recent years, with a major contribution from younger patients. Maximizing survivorship of these implants has always been a point of emphasis. Early TKA designs with cementless fixation were associated with high rates of complications and implant failures. Read More

Int Orthop 2020 Jun 5;44(6):1063-1069. Epub 2020 Apr 5.

Artromedical Orthopaedic Clinic, Chrobrego 24, 97-400, Belchatow, Poland.

Purpose: Spontaneous osteonecrosis of the knee (SONK) is said to be a relatively common disease which may lead to an end-stage osteoarthritis of the knee. The aim of this paper was to review the literature on this field published until now, discuss the results of both conservative and surgical treatment options, as well as to introduce new methods of treatment, which may be applicable in SONK treatment.

Methods: We searched the PubMed and Cochrane databases until November 2019 and presented the most recent findings in this work. Read More

Knee Surg Sports Traumatol Arthrosc 2020 Apr 1. Epub 2020 Apr 1.

Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.

Purpose: Although several small-scale studies have reported risk factors for surgical site infection (SSI) after high tibial osteotomy (HTO), no study has collectively analysed risk factors in a large cohort. The present study aimed to clarify the risk factors for SSI after HTO using a national database.

Methods: Data of inpatients who underwent HTO from 2010 to 2017 were obtained from the Diagnosis Procedure Combination database in Japan. Read More

Br J Haematol 2020 May 24;189(4):e177-e181. Epub 2020 Mar 24.

Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN, USA.

Acta Orthop Traumatol Turc 2020 Jan;54(1):66-73

Department of Orthopaedics and Traumatology, Ankara University, School of Medicine, Ankara, Turkey.

Objective: The aim of this study was compare the clinical success of treatments for avascular necrosis and osteochondritis dissecans in cases who underwent matrix autologous chondrocyte implantations, and evaluate cartilage thickness on the clinical outcomes after implantation.

Methods: A total of 37 patients (29 men, and 8 women; mean age: 23.8 years (16-38)) were treated prospectively with a two-stage matrix autologous chondrocyte implantation (avascular necrosis, n=21; osteochondritis dissecans, n=18). Read More

J Exp Orthop 2020 Mar 14;7(1):14. Epub 2020 Mar 14.

Department of Orthopedic Surgery and Joint Reconstructive Surgery, Toyama Municipal Hospital, 2-1 Imaizumi Hokubu-machi, Toyama, 939-8511, Japan.

PurposeThere have been few reports on medial tibial plateau osteonecrosis, and treatment options remain controversial. This study aimed to evaluate the clinical outcomes of open-wedge high tibial osteotomy (OWHTO) for osteonecrosis of the medal tibial plateau.MethodsPatients who underwent OWHTO for spontaneous osteonecrosis of the medial tibial plateau from November 2013 to September 2017 at our institution and followed up for at least 2 years after surgery were included in this study. Read More

Clin Orthop Surg 2020 Mar 13;12(1):49-54. Epub 2020 Feb 13.

Department of Orthopaedic Surgery, Kosin University College of Medicine, Busan, Korea.

Background: We aimed to confirm the long-term effect of patellar nonresurfacing (patellar decompression) in preventing anterior knee pain after total knee arthroplasty (TKA) and to investigate the possible complications.

Methods: Among patients who underwent primary TKA after being diagnosed as having advanced osteoarthritis (Kellgren-Lawrence grade 4) at our institution from January 2004 to December 2010, 121 patients who were followed up for more than 7 years were included in this study. Patients who underwent TKA with and without patellar decompression were classified as the study group and control group, respectively. Read More

Hinyokika Kiyo 2020 Jan;66(1):23-27

The Department of Urology, Ijinkai Takeda General Hospital.

For the management of patients with castration-resistant prostate cancer with bone metastases, bisphosphonates and denosumab are used to prevent skeletal related events. Osteonecrosis of the jaw and hypocalcemia have been reported in patients treated with denosumab, but there have been few reports of atypical femoral fracture (AFF). Here, we report a case of AFF after dosing denosumab. Read More

Medicine (Baltimore) 2020 Jan;99(5):e18989

Shizuoka Tokusyukai Hospital, Shizuoka.

Rationale: Although the treatment of femoral head necrosis has already been established with the adoption of daily teriparatide, a clear consensus on the treatment of spontaneous osteonecrosis of the knee (SONK) has yet to be reached. Therefore, we focused on the treatment of SONK with daily teriparatide administration (20 μg, subcutaneous) and confirmed its effects to determine whether it is a valid option.

Patients' Concerns: Three osteoporotic patients who were diagnosed with SONK complained of knee pain. Read More

SICOT J 2020 22;6. Epub 2020 Jan 22.

Charlotte Maxeke Johannesburg Academic Hospital, Jubilee Road, Parktown, Johannesburg, Gauteng 2196, South Africa.

Aim: The aim was to assess the seroprevalence of Human Immunodeficiency Virus (HIV) in non-haemophilic patients undergoing primary Total Joint Arthroplasty (TJA) at an academic hospital in South Africa.

Methods: A retrospective review of all Total Hip Arthroplasty (THA) and Total Knee Arthroplasty (TKA) patients from January 2017 to December 2018 was conducted. All patients awaiting TJA were offered HIV screening and their demographic data were recorded. Read More

Arthrosc Tech 2019 Oct 19;8(10):e1115-e1120. Epub 2019 Sep 19.

Department of Orthopedic Surgery, Akershus University Hospital, Lørenskog, Norway.

Osteochondritis dissecans (OCD) of the knee affects children and adolescents. The condition is characterized by sterile osteonecrosis of the subchondral bone. The cause is unknown. Read More

Surg Technol Int 2020 May;36:281-287

Hôpital Antoine-Béclère Université Paris-Sud, Clamart, Franc.

Background: The knee is the second-most common location for osteonecrosis, although it is affected much less often than the hip. Core decompression by precise drilling into ischemic lesions of the femoral condyle while remaining extra-articular is a challenge, particularly in obese patients. For cell therapy, exact localization of the injection point is important to avoid intra-articular injection. Read More

Orthop Surg 2020 Feb 1;12(1):38-49. Epub 2019 Dec 1.

Department of Orthopaedics, West China Hospital/West China School of Medicine, Sichuan University, Chengdu, China.

Objective: To assess the safety and effectiveness of one-stage total joint arthroplasty (TJA) or revision for seronegative infections after total hip arthroplasty (THA) and total knee arthroplasty (TKA).

Methods: This retrospective study included a total of 495 patients who had undergone one-stage total joint (hip or knee) arthroplasty or revision with a diagnosis of osteoarthritis secondary to sepsis, osteoarthritis or osteonecrosis of the femoral head (ONFH) secondary to internal fixation surgery of the hip joint, and one-stage revision for prosthesis loosening after THA or TKA from January 2012 to December 2016. Bacterial cultures were taken from all patients (from joint fluid or articular cavity fluid and four to six different parts of soft tissues) during the operation. Read More

Clin Sports Med 2020 Jan;39(1):57-68

Twin Cities Orthopedics, 4060 West 65th Street, Edina, MN 55435, USA. Electronic address:

Meniscus root tears biomechanically disrupt normal joint loading and lead to joint overload with the possible development of spontaneous osteonecrosis of the knee and early-onset osteoarthritis. Proper identification and treatment of meniscal root tears has been proven to restore joint loading and improve patient outcomes. Read More

Knee Surg Sports Traumatol Arthrosc 2019 Nov 20. Epub 2019 Nov 20.

Department of Orthopedic Surgery and Sports Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.

Purpose: The purpose of this study was to create a predictive model utilizing baseline demographic and radiographic characteristics for the likelihood that a patient with subchondral insufficiency fracture of the knee will progress to knee arthroplasty with emphasis on clinical interpretability and usability.

Methods: A retrospective review of baseline and final radiographs in addition to MRIs were reviewed for evaluation of insufficiency fractures and associated injuries. Patient and radiographic factors were used in building predictive models for progression to arthroplasty with Train: Validation: Test subsets. Read More

Int J Surg Case Rep 2019 28;65:135-140. Epub 2019 Oct 28.

Department of Orthopedic Surgery, Kanazawa Medical University, Japan.

Introduction: Causality for postarthroscopic osteonecrosis of the knee is unknown, and related mechanisms have been poorly characterized.

Presentation Of Case: This report describes a case of a 69-year-old man with subchondral fracture occurring after arthroscopic meniscectomy using a radiofrequency assisted shaver. The patient experienced increasingly intense knee pain 10 months after the meniscectomy. Read More

J Orthop Surg Res 2019 Nov 9;14(1):352. Epub 2019 Nov 9.

Department of Bone Tumor, Tianjin Hospital, 406 Jiefang Southern Road, Tianjin, China.

Background: Aseptic loosening has become the main cause of prosthetic failure in medium- to long-term follow-up. The objective of this study was to establish and validate a nomogram model for aseptic loosening after tumor prosthetic replacement around knee.

Methods: We collected data on patients who underwent tumor prosthetic replacements. Read More

Medicine (Baltimore) 2019 Nov;98(44):e17248

Department of Orthopedic Surgery, Research Institute of Clinical Medicine of Chonbuk National University-Biomedical Research Institute of Chonbuk National University Hospital.

Rationale: Intra-articular corticosteroid injection (IACI) is a cost-effective conservative treatment of mild-to-moderate osteoarthritis. Adverse events after this procedure range from life-threatening systemic reactions to self-limiting local reactions. To our knowledge, this is the 1st report of osteonecrosis (ON) in the medial tibial plateau after IACI. Read More

J Pediatr 2020 02 1;217:210-210.e1. Epub 2019 Nov 1.

Department of Pediatrics, Hsinchu MacKay Memorial Hospital, Hsinchu City; Department of Medicine, MacKay Medical College, New Taipei City, Taiwan.

Bone Joint J 2019 Nov;101-B(11):1356-1361

Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA.

Aims: Knee osteonecrosis in advanced stages may lead to joint degeneration. Total knee arthroplasty (TKA) for osteonecrosis has traditionally been associated with suboptimal results. We analyzed outcomes of contemporary TKAs for osteonecrosis, with particular emphasis on: survivorship free from aseptic loosening, any revision, and any reoperation plus the clinical outcomes, complications, and radiological results. Read More

Inflamm Regen 2019 22;39:20. Epub 2019 Oct 22.

Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Shogoin, Kawahara-cho 54, Sakyo-ku, Kyoto, 606-8507 Japan.

Bone regeneration has been the ultimate goal in the field of bone and joint medicine and has been evaluated through various basic research studies to date. Translational research of regenerative medicine has focused on three primary approaches, which are expected to increase in popularity: cell therapy, proteins, and artificial materials. Among these, the local injection of a gelatin hydrogel impregnated with the protein fibroblast growth factor (FGF)-2 is a biomaterial technique that has been developed in Japan. Read More

Radiology 2019 12 15;293(3):656-663. Epub 2019 Oct 15.

From the Department of Radiology, Boston University School of Medicine, 820 Harrison Ave, FGH Building, 3rd Floor, Boston, MA 02118 (A.J.K., F.W.R., A.M.M., L.E.D., M.D.C., A.G.); Department of Radiology, Friedrich-Alexander University Erlangen-Nürnberg (FAU) and University Hospital Erlangen, Erlangen, Germany (F.W.R.); Department of Radiology, Veterans Affairs Hospital, Boston, Mass (L.E.D., A.G.); and Institute of Sports Imaging, French National Institute of Sports (INSEP), Paris, France (M.D.C.).

Osteoarthritis (OA) of the hip and knee is among the most common joint disorders. Intra-articular corticosteroid (IACS) injections are frequently performed to treat OA and other joint-related pain syndromes; however, there is conflicting evidence on their potential benefit. There is a lack of prospective and large retrospective studies evaluating potential joint findings, including increased risk for accelerated OA progression or adverse joint events, after treatment with IACS injection. Read More

Sci Rep 2019 09 10;9(1):13046. Epub 2019 Sep 10.

Osteonecrosis and Joint Reconstruction Ward, Department of Joint Surgery, HongHui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710054, China.

The fabella is a sesamoid bone of the knee that can degenerate in some patients with osteoarthritis. The purpose of this study was to examine the prevalence and degeneration grades of fabellae in the Chinese population and to analyse their relationships with subject ages and knee osteoarthritis grades. The anteroposterior and lateral knee roentgenograms of 1150 subjects were recruited from the institutional database. Read More

Reumatologia 2019 28;57(3):182-187. Epub 2019 Jun 28.

Department of Pediatric Rheumatology, Cukurova University Faculty of Medicine, Adana, Turkey.

Systemic lupus erythematosus (SLE) is an autoimmune disorder characterized by malar rash, oral ulcers, arthralgia, photosensitivity and nephritis. Herein, we report a rare comorbidity, multiple avascular necrosis (AVN), in an adolescent SLE patient and also highlight the importance of risk factors for this comorbidity with a brief literature review. A 13-year-old female patient was admitted with severe headache, visual plus auditory hallucinations, polyarthritis and a history of recurrent oral ulcers. Read More

J Arthroplasty 2019 Dec 29;34(12):2903-2908. Epub 2019 Jul 29.

Department of Orthopaedic Surgery, APHM, Institut du Mouvement et de l'appareil Locomoteur, Sainte-Marguerite Hospital, Marseille, France; Aix-Marseille University, CNRS, Marseille, France.

Background: During medial unicompartmental knee arthroplasty (UKA), tibial tray implantation requires compromise between bone coverage and rotational position. It was hypothesized that morphometric tibial tray (MTT) would improve implant positioning and subsequently clinical outcomes as compared to symmetric tibial tray (STT).

Methods: A total of 106 patients who underwent medial UKA in our department between January 2017 and March 2018 were included matched on gender and age (53 in each group). Read More

Cartilage 2019 Aug 17:1947603519865308. Epub 2019 Aug 17.

2 Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria.

Objective: Since the first introduction of the MOCART (Magnetic Resonance Observation of Cartilage Repair Tissue) score, significant progress has been made with regard to surgical treatment options for cartilage defects, as well as magnetic resonance imaging (MRI) of such defects. Thus, the aim of this study was to introduce the MOCART 2.0 knee score - an incremental update on the original MOCART score - that incorporates this progression. Read More

J Orthop Surg Res 2019 Jul 25;14(1):237. Epub 2019 Jul 25.

State Key Laboratory of Pharmaceutical Biotechnology, Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital affiliated to Medical School of Nanjing University, Nanjing, China.

Background: Meniscal horns are important structures of meniscus, and longitudinal tears of these places could significantly change the load distribution among the knee joint. Few studies concerned the stress concentrated on bones, which may induce the osteonecrosis of subchondral bone. The goal of this study was to construct a finite element (FE) model with high fidelity of the knee joint and evaluate the biomechanical changes of load distribution of components after longitudinal tears of the horns of meniscus. Read More

Knee 2019 Oct 9;26(5):1111-1116. Epub 2019 Jul 9.

Nishinomiya Joint Reconstruction Center, Nishinomiya Watanabe Hospital, Nishinomiya, Japan.

Background: Unicompartmental knee arthroplasty (UKA) is an option for the treatment of spontaneous osteonecrosis of the knee (SONK). However, there are limited studies focusing on this area. This study presents medium-term clinical outcome data of UKA for SONK. Read More

Orthopedics 2019 Nov 3;42(6):e552-e554. Epub 2019 Jul 3.

Patellar osteonecrosis is a rare condition, although knee osteonecrosis has been described in the arthroplasty literature. This is the first case describing knee arthroscopy as the cause of osteonecrosis. A 50-year-old woman who was experiencing knee pain during her marathon training and singles tennis underwent knee arthroscopy for a torn medial meniscus. Read More

Skeletal Radiol 2019 Dec 27;48(12):1961-1974. Epub 2019 Jun 27.

Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, GA, USA.

Objective: To propose an magnetic resonance imaging (MRI) grading system for subchondral insufficiency fracture of the knee (SIFK) to predict outcome and assess risk factors.

Materials And Methods: A total of 50 SIFK patients were retrospectively reviewed utilizing two MRI examinations approximately a year apart and compared them with 51 control subjects. A grading system was introduced that classifies lesions as low- vs high-grade. Read More

Radiologe 2019 Jul;59(7):647-662

Klinik für Diagnostische und Interventionelle Radiologie und Neuroradiologie, Universitätsklinikum Augsburg, Stenglinstraße 2, 86156, Augsburg, Deutschland.

Subchondral osteonecrosis of large weight-bearing joints (hip and knee joints) represents a severe and joint-threatening disease. Apart from idiopathic forms, glucocorticoid medication and alcohol abuse have been identified as major causative factors for atraumatic osteonecrosis. In addition to direct cytotoxic factors, a critically reduced perfusion of the subchondral osseous space will eventually lead to bone marrow ischemia and osseous necrosis. Read More

J Arthroplasty 2019 Nov 6;34(11):2606-2613. Epub 2019 Jun 6.

Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.

Background: Bearing dislocation is a serious complication of unicompartmental knee arthroplasty (UKA) with the Oxford knee prosthesis equipped with a mobile bearing. We aimed to clarify the extent of intraoperative movement of the mobile bearing and its relationship with the positioning of prosthesis components in patients undergoing Oxford UKA.

Methods: This retrospective study included 50 patients (50 knees) who underwent Oxford UKA for anteromedial osteoarthritis or osteonecrosis of the knee. Read More

Pan Afr Med J 2019 25;32:88. Epub 2019 Feb 25.

Departments of Orthopedic Trauma, The First Hospital of Jilin University, Changchun, China.

Traumatic anterior hip dislocation is rare, because the hip joint is a highly stable joint. It is extremely rare for the anterior hip dislocation with combined bilateral femoral fracture in children. We present a case of 7-year-old boy with traumatic anterior hip dislocation with associated bilateral femoral fractures. Read More